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Investments in Unconsolidated Subsidiaries - Investments (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Sep. 21, 2022 | Mar. 31, 2022 | Dec. 31, 2021
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Schedule of Equity Method Investments [Line Items] |  |  |  |
Total investment in unconsolidated subsidiaries | $ 1,461,287 |  |  | $ 1,196,088
Altus Power, Inc. |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Total investment in unconsolidated subsidiaries | 391,890 |  |  | 368,368
Real estate investments |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Total investment in unconsolidated subsidiaries | $ 617,099 |  |  | 453,813
Class A common stock |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Common stock shares (in shares) | 22,000,000 |  |  |
Shares converted to Class A common stock (in shares) |  |  | 2,011 |
Class A common stock | Altus Power, Inc. |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Total investment in unconsolidated subsidiaries | $ 270,342 |  |  | 229,900
Alignment shares |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Alignment shares converted (in shares) |  |  | 201,250 |
Alignment shares | Altus Power, Inc. |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Total investment in unconsolidated subsidiaries | 121,549 |  |  | 114,727
Private placement warrants | Altus Power, Inc. |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Total investment in unconsolidated subsidiaries | 0 |  |  | 23,741
Warrants, exercised (in shares) |  | 2,552,390 |  |
Conversion rate |  | 27.63% |  |
Other |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Total investment in unconsolidated subsidiaries | $ 452,298 |  |  | $ 373,907

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